NAHD00901LP GAS Natural Gas to Propane Gas Conversion Kit Accessory, Condensing and Non-Condensing Gas Furnaces, 40,000 to 140,000 BTUH Models NAHD00901LP GAS Natural Gas to Propane Gas Conversion Kit Accessory, Condensing and Non-Condensing Gas Furnaces, 40,000 to 140,000 BTUH Models